The problem with folks who like to kill others is that "others" extends beyond "bad guys." I have a problem with people killing other people unless it's in self defense, or in time of war. Retribution killing may have its place, but that place should be VERY narrowly defined.

Psychos who like to kill people simply like to kill people, and the type of people they chose to kill are usually those over whom they have a tremendous advantage. It's one thing to kill an enemy soldier from ambush, it's another to kill an enemy civilian from ambush. Those who don't recognize the difference are a menace to society.

Not many problems you can't fix
With a 1911 and a 30-06